ax·le /ˈæksəl/
輪軸,車軸
Ax·le n.
1. The pin or spindle on which a wheel revolves, or which revolves with a wheel.
2. A transverse bar or shaft connecting the opposite wheels of a car or carriage; an axletree.
3. An axis; as, the sun's axle.
Had from her axle torn
The steadfast earth. --Milton.
Note: ☞ Railway axles are called leading and trailing from their position in the front or in the rear of a car or truck respectively.
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axle
n : a shaft on which a wheel rotates